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W = 120J
W=F*s
F = g*m
W = g*m*s
120 = 10*m*0,8
m = 15kg
F= W/s
F= 120/0,8= 150N
F=m*g |:g
m=F/g
m=150/10=15kg
Odp. Masa tego ciała wyniosła 15kg